Well, I figured out my error was skipping over circumference. Then, my brain began to hurt, so I had my engineer friend build a spreadsheet for me. I found out that my speedo is about 6 mph off (assuming unloaded tire circumference) at cruise velocity. When my speedo says 81, I am really going 75.
This kind of ticks me off. The Belle tire guys told me not to worry about it, that it was too small of a difference to matter. I'd like to show them this spreadsheet.
As a side note, this spreadsheet would be a GREAT tool to put up in some sort of FAQ section on this site.
This kind of ticks me off. The Belle tire guys told me not to worry about it, that it was too small of a difference to matter. I'd like to show them this spreadsheet.
As a side note, this spreadsheet would be a GREAT tool to put up in some sort of FAQ section on this site.
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